The correct answer is B, A dollar of fiscal stimulus creates more than a dollar of economic growth. This reflects the core Keynesian concept known as the multiplier effect. According to Keynesian economic theory, government spending can stimulate economic activity beyond the initial amount spent. For example, if the government spends money on infrastructure, workers and suppliers receive income, which they then spend, creating additional rounds of economic activity.

Keynesians believe that during periods of economic slowdown or recession, active government intervention through fiscal policy (such as increased government spending or tax cuts) is necessary to boost demand and reduce unemployment. This contrasts with classical or free-market theories.

Choice A reflects classical economic theory, which emphasizes limited government and free markets. Choice C aligns more with supply-side economics, which focuses on incentives for production. Choice D is incorrect because Keynesian theory generally places greater emphasis on fiscal policy rather than monetary policy as the primary tool for economic stabilization.

Thus, the multiplier effect described in choice B is a fundamental principle of Keynesian economics and the best answer.